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huong2k22903
2 năm trước
một mảnh vườn hình thang có tổng số đo hai đáy là 140m, chiều cao bằng 4/7 tổng sooa đo hai đáy. a) hỏi diện tích mảnh vườn là bao nhiên mét vuông? b) người ta sử dụng 30,5% diện tích mảnh vườn để trồng xoài. hãy tính phần trăm diện tích trồng xoài.
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